SPORT: Which former British male tennis player is now a presenter on GMTV?

Questions

In a medieval motte and bailey castle,what was the motte?

The Austrians invented them in the 19th century by hanging them from balloons, what were they?

What was the nilometer used for in Ancient Egypt?

What was used in ancient egypt to measure the depth of the Nile?

What was the name of the hill near Jerusalem where where Jesus was crucified?